66157974 has 12 divisors (see below), whose sum is σ = 143342316. Its totient is φ = 22052652.

The previous prime is 66157967. The next prime is 66158003. The reversal of 66157974 is 47975166.

It is a happy number.

66157974 is a `hidden beast` number, since 6 + 6 + 1 + 579 + 74 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1837704 + ... + 1837739.

It is an arithmetic number, because the mean of its divisors is an integer number (11945193).

Almost surely, 2^66157974 is an apocalyptic number.

66157974 is an abundant number, since it is smaller than the sum of its proper divisors (77184342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66157974 is a wasteful number, since it uses less digits than its factorization.

66157974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3675451 (or 3675448 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 66157974 is about 8133.7552212985. The cubic root of 66157974 is about 404.4461748764.

The spelling of 66157974 in words is "sixty-six million, one hundred fifty-seven thousand, nine hundred seventy-four".